So I am curious about the possibility of making custom torque boxes and wanted feedback or if anyone else has done this.
I have had my new floor, cowls, and rail work done and it is nice and clean with no torque boxes installed yet. I was thinking about making a torque box, well not really a box, but using tube steel or square steel stock and welding together a custom made frame that will go in place of a torque box but would be welded in all the same stress points. I just think it would be cleaner, no chance of future rusting out, and stronger.
I like the idea. I will eventually need to replace the passenger side on my 68 and was wondering the same thing. I visualize something like a capital letter “H” (or a tie fighter without the cockpit bubble), where the legs of the H (or solar panel parts) are flat rectangular plates that get welded to the rocker panel and floor support and the horizontal part is some strong 2" or so tubing. I’d add some gussets to where the tubing attaches to the legs to further prevent twisting.
From an engineering standpoint the structure is triangulated through the flat metal plate and the triangular gussets at the ends. The Ford engineers knew what they were doing. IF you use the two plates with the tube in between you are not addressing the right forces. The tube structure would be very strong from a side impact, but would do little to control the twisting forces that the torque box is there to control.
When you look at a flat rectangular plate, what you need to visualize, from a structural integrity standpoint, is a set of triangles. The hypotenuse is created by an imaginary line connecting the opposite corners. If you took Yorgle’s drawing and made the gussets as large as possible they would extend from the bottom of one leg to the top of the other. Put two together, and you get a flat rectangular plate. This takes care of forces in the horizontal plane, but you also have force in the vertical" you don’t what the sub-frame to be able to rotate relative to the body. This is where the triangular end plates come into play. By connecting the end plates to the flat plate and the floor, creating a wedge shaped box, you are really adding strength in both planes.
I agree, but the Ford engineers were limited to using stamped sheet metal, in which the only way to create a rigid structure is by making a box. I expect that all (or even more) rigidity of the original torque box could be created in other shapes using thicker and stronger materials, such as plates and tubing.
I have seen somthing like this done on 65-66 mustang/shelby race cars. I think they used 2" x 3" rectangle with te ends cut at an angle to tie the brace in closer to the suspension on the frame rail. Mike
Well, if you want cleaner and rust defying, then just build a torque box like the factory ones. But use better materials and an eye for aesthetic as you make them.
The factory ones are a good solution that doesn’t add weight to the car without giving a high return on increased stiffness per kg of metal used.
Fun fact: Too much power in these cars without enough chassis stiffness will shatter the windshield and pop all the rubber out of the firewall.
Hi guys I am very curious about the best solution to strengthen the frame of my 69 Cougar. I’m going to put 450 - 500 hp under the hood
I found these Tin Man Fabrication Subframe Connectors to tie the front and the back of the car together and wanted to tie everything together to strengthen the frame under the car was wondering is there a way too strengthen the frame through the torque boxes or is that not something I should do.
I am also wanting to put a four link suspension under the rear end is there a better way to weld a sub frame under to car. Any help is greatly appreciated I’m new to this unibody stuff and don’t want this car to flex.
Have any of you guys built a race car out of a 69 Cougar I’d like to hear how you have approached this. In regards to tying. the frame together to strengthen your car to prevent twisting?
Thoughts on the Torque box’s is there a way to strengthen these areas?
Have any of guys put a 4 link suspension 9” rear ended under your car? Pro’s - Cons all information welcome.
I want this to be a street legal car..
My front torq box’s are in pretty bad shape and the floor pretty rusty along the rocker panels and I’m going to replace it.
These frame rails look to be a way to tighten things up…
about the possibility of making custom torque boxes and wanted feedback or if anyone else has done this.
